Zadanie 1f
Wzorowane na: Chemistry HL Paper 3, May 2023, TZ1, pytanie 1(f). Treść, dane i kontekst są zmienione; sprawdzane umiejętności, format i punktacja jak w oryginale.
Darmowe konto pozwoli wrócić do niego później.
Informacja do zadań 1a-1f.
The table gives the first ionization energy and the first electron affinity of the elements in period 3 of the periodic table.
| Element | First ionization energy / kJ mol−1 | First electron affinity / kJ mol−1 |
|---|---|---|
| Na | 496 | −53 |
| Mg | 738 | +40 |
| Al | 578 | −42 |
| Si | 787 | −134 |
| P | 1012 | −72 |
| S | 1000 | −200 |
| Cl | 1251 | −349 |
| Ar | 1520 | +96 |
Polecenie
Suggest whether the first electron affinity of xenon is greater or smaller than that of argon, and give one reason for your answer.
Sprawdź rozwiązanieUkryj rozwiązanieKlucz i punktacja
Odpowiedź z klucza
ALTERNATIVE 1:
«Xe» lower/smaller/less positive AND larger atomic radius/added electron is further from the nucleus ✔
OR
«Xe» lower/smaller/less positive AND smaller energy gap to the next main energy level ✔
ALTERNATIVE 2:
«Xe» greater/more positive AND much higher nuclear charge ✔
OR
«Xe» greater/more positive AND poor shielding by the inner d electrons ✔
Schemat punktowania
Award [1] for the comparison together with a matching reason. Accept the converse argument only if it is clear that argon is the atom being described.
Komentarz
The measured trend is that xenon is lower than argon, but both alternatives are accepted because the question asks only for a suggestion with a reason.